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Spectrometric Determination of Detergency of Laundry Detergents Using Sudan Red IV as Label

Spektrometrische Bestimmung der Waschkraft von Waschmitteln mittels Sudan-Rot IV als Markierung
H. Li, Y. Wang and Y. Hu


A new spectroscopic method was proposed for evaluating detergency of laundry detergents. In the determination process, salad oil labeled by Sudan Red IV was the simulated lipidic dirt, which was distributed on textile by a centrifugal way adding ultrasonic to simulate the washing mechanical force. The residual oil left after washing was determined according to the maximum absorbance of Sudan Red IV at 502nm. The method precision was satisfactory with a relative standard deviation of RSD = 2%. The relative deviation between the spectrometric and the gravimetric method was less than 2%.


Zur Bewertung der Waschkraft von Waschmittel wurde eine neue spektroskopische Methode vorgeschlagen. Bei diesem Bestimmungsverfahren wurde Salatöl, markiert mit Sudan-Rot IV, zur künstlichen Fettanschmutzung eingesetzt, dass auf Textilien zentrifugal verteilt im Ultraschall zugesetzt wurde, um den mechanischen Einfluss des Waschprozesses zu simulieren. Das noch vorhandene Restöl nach dem Waschen wurde am Absorbtionsmaximum von Sudan-Rot IV bei 502nm bestimmt. Die Genauigkeit der Methode war mit einer relativen Standardabweichung von RSD = 2% zufriedenstellend. Die relative Abweichung zwischen der spektrometischen und gravimetrischen Methode war kleiner als 2%.

Yuzhu Hu, Postal: Box 41, 24 Tongjia Lane, Nanjing, 210009, China, Tel.: 0086-025-83271280, Fax: 0086-025-83271280. E-mail:

Hongmei Li was born in 1969 in Luoshan, China, and received her master degree in coordination chemistry in 1999 at Central China Normal University. After 2000, she became a lecturer of Department of Inorganic Chemistry, School of Basic Science, China Pharmaceutical University. Since 2001, she has been PhD candidate in Pharmaceutical Analysis at China Pharmaceutical University.

Yunqing Wang was born in 1982 in Heilongjiang, China, and graduated from China Pharmaceutical University in 2004. Since then, he has been PhD candidate in Pharmaceutical Analysis at China Pharmaceutical University.

Yuzhu Hu was born in 1947 in Jiangsu, China, and graduated from Beijing University in 1970. After studying pharmaceutical analysis, she received her master degree and was employed at China Pharmaceutical University (CPU). In the period as a visiting scientist from 1987 to 1989 in Belgium, she had received her PhD at pharmaceutical college from Brussels Freedom University. After 1996, she has been Professor of CPU. She was appointed the heads of department of analytical chemistry and basic science school in CPU. She has been a fellow of Chinese Society of Chromatography and a new drug syndic expert now.


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Received: 2006-08-28
Published Online: 2013-03-31
Published in Print: 2006-12-01

© 2006, Carl Hanser Publisher, Munich